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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67d8b59168282eddafdcea9a84070f2451fdd7555ed8ded8e12c7efec0d380e5' 
  AND token = 'mXLiVnVi54783NeIjpZa7lDU0b74ZWAQ+PpIAaPPy24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}